Family Friendly & Specialty Dentists in London, UK
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Notation
- Universal system of notation designates deciduous maxillary lateral incisors with uppercase letters (D and G)
- International notation designates deciduous maxillary lateral incisors with numbers (52 and 62)
- Permanent maxillary lateral incisors in universal system are designated by numbers (7 and 10)
- Palmer notation uses numbers and symbols to designate quadrant and laterality of the tooth
- FDI notation has different numbering system for permanent maxillary lateral incisors (12 and 22)
Development
- Primary maxillary lateral incisor develops between 14-23 weeks in utero
- Permanent maxillary lateral incisor typically erupts around 8-9 years old
- Crown development of the tooth is completed by age 4-5
- Upper lateral incisor is made of 4 lobes of calcification
- Upper lateral incisors can have variations in shape and sometimes be missing
Deciduous dentition
- Two maxillary lateral incisors in deciduous dentition
- Distoincisal angle of deciduous maxillary lateral incisor is more curved than primary maxillary central incisor
- Primary lateral incisor is longer cervicoincisally than mesiodistally
- Average length of primary lateral incisor is 15.8 mm, with crown length of 5.6 mm and root length of 11.4 mm
- Primary lateral incisor crown is wider mesiodistally and has longer roots compared to permanent tooth
Permanent dentition
- Two maxillary lateral incisors in permanent dentition
- Development of permanent maxillary lateral incisors begins at 10-12 months after birth
- Permanent lateral incisor resembles central incisor but is smaller in every dimension except root length
- Root of permanent lateral incisor is around 1.5 times the length of the crown
- Permanent lateral incisors can have variations in crown shape and can be congenitally missing
Tooth aspects
- Labial aspect: Maxillary lateral incisor has rounded mesial and distal incisal angles, smooth surface, and fits into a trapezoid shape
- Lingual aspect: Prominent cingulum, concave lingual fossa, and fits into a trapezoid shape
- Mesial aspect: Cementoenamel junction sharply inclines towards incisal ridge, fits into a triangle shape
- Distal aspect: Distal cervical line is slightly more cervical, may have developmental groove, fits into a triangle shape
- References: Citations from various sources for further reading and study
